MySQL 外键引用的表名总是强制小写

Question

首先，创建这两个表:

CREATE TABLE IF NOT EXISTS TAB_COMPANY (
  ID INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  NAME VARCHAR(100) NOT NULL,
  PRIMARY KEY(ID),
  UNIQUE KEY(NAME)
) ENGINE=INNODB DEFAULT CHARSET=UTF8;

CREATE TABLE IF NOT EXISTS TAB_DEPARTMENT (
  ID INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
  NAME VARCHAR(100) NOT NULL,
  COMPANYID INT(10) UNSIGNED NOT NULL,
  PRIMARY KEY(ID),
  INDEX FK_TAB_DEPARTMENT_TAB_COMPANY_COMPANYID(COMPANYID ASC),
  CONSTRAINT FK_TAB_DEPARTMENT_TAB_COMPANY_COMPANYID
    FOREIGN KEY (COMPANYID) REFERENCES TAB_COMPANY(ID) ON DELETE CASCADE
) ENGINE=INNODB DEFAULT CHARSET=UTF8;

然后显示创建表 TAB_DEPARTMENT:

CREATE TABLE `TAB_DEPARTMENT` (
  `ID` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `NAME` varchar(100) NOT NULL,
  `COMPANYID` int(10) unsigned NOT NULL,
  PRIMARY KEY (`ID`),
  KEY `FK_TAB_DEPARTMENT_TAB_COMPANY_COMPANYID` (`COMPANYID`),
  CONSTRAINT `FK_TAB_DEPARTMENT_TAB_COMPANY_COMPANYID` FOREIGN KEY (`COMPANYID`)
REFERENCES `tab_company` (`ID`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8

外键引用子句中的表名强制小写。

mysql> show variables like '%lower%';
lower_case_file_system ON
lower_case_table_names 0

mysql> show variables like 'version';
version 5.1.43-community

我的平台是带有 SP3 的 Window XP。我在 Linux 上测试过，没问题。

有没有人遇到过这个问题？我已经向 MySQL 报告了一个错误。

刚试了5.1.49-community版本，问题依旧。

Answer 1

得到MySQL的回复:

From Miguel Solorzano:

Thank you for the bug report. This a documented restriction of InnoDB table:

http://dev.mysql.com/doc/refman/5.1/en/innodb-restrictions.html

"On Windows, InnoDB always stores database and table names internally in lowercase. To move databases in a binary format from Unix to Windows or from Windows to Unix, you should create all databases and tables using lowercase names. "